Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae98357ac5ce4218…

MALICIOUS

PDF

89.2 KB Created: 2021-07-01 16:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4025f9d5f2d87e889d6a98464ea01ba SHA-1: 1d98403ccc657c26dd423b2eec007630e8795c0c SHA-256: ae98357ac5ce42183c8cb2402a111d536f6d4ce20f30f83c75aa260c0e0e84a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or appear to be part of a link farm on disposable hosting. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://obchodsezlatem.cz/upload/files/61582490269.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a27d86a79e---19963561352.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/qrehb1n21meft7ueafo800o9j3/xaruxepiripa.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094990a3acc6---gexag.pdf
    • https://foulardfotografando.it/file/futinib.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7a3d816b1---77208699959.pdf
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/xesemadobugetewusaju.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/jc5gcei4buqjmtt795lqcef2s3/kikizivaja.pdf
    • http://softwarefactory.nl/images/file/89091536770.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f25e91edae6e890c9371f13cedec6185/96562502424.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/19097525b5bbb4e6274f85e3f31900a3/43607087780.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ffa85c587---22971567029.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a73095ab5a---tikibe.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9876773c83---74228146193.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105110656475934.pdf
    • http://ttmplus.com/userfiles/files/88739298663.pdf
    • https://lawyerupsmart.com/tempimg/file/86758699341.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/9aa30d22790f2798d9ab2a196eff981d/37978818214.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/779bd668bb3196d69e833351d10af9f7/lemubote.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9bd410b61---zurekefolonokotijuda.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ab50481b2---tomakanosu.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adbd7e12bf8---munujozuveragabijaguzoxor.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f1d96169fdeea41e5c3386374d46983d/3471290678.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=highest+paying+nuclear+jobs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f99d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 16792 bytes
font_01_sfnt_off000111b4.bin
43f66820591c1328b9f78753d44b608f26b31cb6967e90d50eb92c4c203603ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 11128 bytes
font_02_sfnt_off00012b60.bin
70802366c80b88a6efd20e57578475cb5ea0c36ddf124acbdd3d9e998cc39cc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B60 16508 bytes